Tele phone-receiver



(No Modell) J. H. TABONY.

TELEPHONE REGEIVER.

No. 360,626. 6 Patented Apr. 5, 1887.

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UNITED STATES PATENT OFFICE.

JOSEPH H. TABONY, OF NEIV ORLEANS; LOUISIANA.

TELEPHONE-RECEIVER.

bPECIl-ICATION forming part of Letters Patent No. 360,626, dated April5, 1887.

Application filed January 31, 1887.

To all whom it may concern.-

Be it known that I, J osnrn H. TABONY, a citizen of the United States,and a resident of the city of New Orleans, in the parish of Orleans andState of Louisiana, have invented certain new and useful Improvements inTelephone-Receivers, of which the following is a specification.

It is a well-known fact that rods of iron, steel, and other magneticmaterials experience a change of length when they are being magnetizedor demagnetized in such a manner that they become larger when magnetizedand shorter when demagnetized. Similar changes occur when the magneticcondition of a magnet-rod is varied, and heretofore several applicationsofthis phenomenon have been made in the arts. Notable among these is thetelephonic receiver of Reis, and my invention, based upon the sameprinciple, may be regarded as an improvement upon the Reis receivcr.

In the annexed drawings, which form a part of this specification, I haveillustrated, in Figure 1, one form which my invention may assume,showing an axial section of my receiving-telephone; and in Fig. 2, adetail of construction.

The main body of the instrument consists of a case, 1, of any suitableform, and a mouthpiece, 2, provided with the usual sound-open- I haveshown a rather short and fiat case, which, if desired, may be providedwith a suitable handle; but it will be understood that I am notrestricted to this shape, since I may use with equal advantage a casehaving the general outline of the ordinary hand-runner, or any othersuitable form.

The numerals 4 5 designate a cup-shaped structure of iron or steel, andif made of the latter material it is magnetized axially, so as to haveone of its poles diffused around its rim 7 and the other pole at thebottom 4, which rests upon the bottom of the case and is secured to thesame by screws, as shown, or otherwise. There is a hole, 8, through thecentral portion of the bottom of the case, and this hole registers witha similar but screw-threaded hole in bottom 4 of the cup-shaped magnet,as shown. A rod, 9, of soft iron, screwthreaded near its lower end,enters the screw-threaded pole of the system.

Serial NoflQGflfiD. (No model.)

hole in the bottom 4 of the cup-magnet, and constitutes the core of theelectromagnet, the coil 10 of which is suitably secured within thecup-magnet. A diaphragm, 11, of any suitable material, is applied uponthe top of the case, and is then, also, in contact with the upper edgeof the cup-magnet, which is flush with the upper end of the case. If thediaphragm is made of magnetic material, it becomes one pole of 6c themagnetic system composed of the cupmagnet, the core, and the diaphragm,the upper free end of the core being then the other The diaphragm isheld in place by the mouthpiece 2, which clamps the former betweenitself and the case.

The core 9 is perforated and serew'threaded axially, and ascrew-threaded pin, 12, of any desired metal enters said perforation,projecting at both ends beyond the same, as is clearly shown in thedrawings. The upper end of pin 12 is tipped with a short piece ofnonmagnetic material, such as ivory, bone, hard rubber, or the like. Thetip 13 is rounded atits extremity, and is adapted to make contact withthe center of the diaphragm in accordance with the variations in thecurrent. It will be noticed that hole 8 is larger than the lower end ofcore 9, so that a tool may be applied to the latter to adjust its upperend nearer to and farther from the diaphragm, as desired. Similarly atool may be applied to the lower projecting end of pin 12,whereby thepin may be so adjusted as to make contact with the diaphragm when inoperation in such a manner as to secure the best results.

The receiver, constructed as described, is placed in a telephoniccircuit, and when, by the action of the distant transmitter, thetelephonic currents pass through coil 10, the core 9 becomes alternatelyelongated and 0011- tracted, and since its lower end is secured to therather thick and inflexible bottom 4 of the cup-magnet the upper end ofsaid core, when elongated, tends to approach to the diaphragm, and whentip 13 is in contact with the center of said diaphragm the latter isforced outwardly toward the mouth-piece.

core is contracted, it recedes from the diaphragm and the relationbetween the latter and the tip is changed; but by reason of the magneticattraction between the diaphragm When the and the core of the magnet thediaphragm is caused to impinge or vibrate against the tip 13. Thus, bythe varying magnetic condition of the core, caused by the telephoniccurrents, the diaphragm is made to. vibrate in response to thesecurrents and to impinge upon the tip quite forcibly, which results inloud sounds, which are heard at the earpiece.

I may dispense with tubular portion 5 of the cup 4: 5, inwhich case thebottom 4 of this structure becomes a simple plate. This is indicated bythe dotted lines 6. The plate 4 is then made of any desired material,not necessarily magnetic. If this construction is adopted, the diaphragmmay also be made of non-magnetic material, and is then vibrated purelyby the elongations and contractions of the core.

Other modifications will suggest themselves to those skilled in the art,and I wish it to be understood that I do not limit myself to the detailsof construction herein described.

Having now fully described my invention, What I claim, and desire tosecure by Letters Patent, is

1. In a telephonic receiver, the combination of a magnetic rod, adjustably fixed at one end, and a diaphragm adapted to vibrate against aprojection from the other end of said rod,with a helix in the telephoniccircuit surrounding said rod, substantially as described.

2. In a telephonic receiver, the combination of a magnetic rod,adjustahly fixed at one end,

and an adjustable pin passing through the axis of said rod, with a tipof ivory or equivalent material secured to the pin, a diaphragm arrangedto vibrate against the tip of the pin,

and a helix in the telephonic circuit surrounding the magnetic rod,substantially as described.

3. In a telephonic receiver, the combination of a eupshaped magnet,having an adjustable core passing through its axis,with a magneticdiaphragm in magnetic contact with the cupmagnet, an adjustable pinpassing through the axis of the magnetic rod and arranged to contactwith the diaphragm, and a helix or coil in the telephonic circuitsurrounding the mag netic rod, substantially as described.

4. In a telephonic receiver. the combination of a cup-shaped magnet anda magnetic dia phragm in contact with one pole of the same, with asoft-iron core forming the other pole, an adjustable pin throughthea-Xis of said core arranged to contact with the diaphragm, and a coilor helix in the telephonic circuit surrounding the core, substantiallyas described.

In testimony whereof I have signed my name to this specification in thepresence of two subscribing witnesses.

JOSEPH II. TABONY.

\Vitncsses:

W. CLARENCE DUVALL, \VM. A. HARnIEs.

